The answer is C.
Answer 1. is incorrect since flowable composite achieves its ability to flow by decreasing the amount of filler particles.
Answer 4. is not correct since flowable composite has decreased strength.
Flowable composites have lower filler content which make it have inferior physical properties such as lower wear resistance and decreased strength. It does have increased wettability. Indications are limited to Class 1 restorations, pit and fissure sealants, cavity liners and margin repair materials.
Roberson T.M., Heymann H.O., and Swift E.J. Studervant’s Art & Science of Operative Dentistry, Fourth Edition, Mosby Inc. 477-478.

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